/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/PBDJointConstraintData.h
If we created particle to serve as kinematic endpoint, track so we can release later. This will add particle to solver.
void SetKinematicEndPoint ( [FSingleParticlePhysicsProxy](API\Runtime\Chaos\PhysicsProxy\FSingleParticlePhysicsProxy) * InParticle, [FPBDRigidsSolver](API\Runtime\Chaos\FPBDRigidsSolver) * Solver )